I’ve noticed this a lot in the past few days. It seems like when a post hits another million or so views (usually reddit posts), the post gets moved BACK to the top of Most Viral, Newest. Is this an intended feature? Because I don’t like it.

I had this happen to me today! My post hit the front page, gradually moved down through Most Viral / newest first then about four hours later was suddenly at the top of most viral / newest first for a second time.
I also noticed another post doing the same.

I’m fairly certain this is a bug rather than an intended feature.

I think you’re right that it seems to be happening with Reddit posts. (My one was posted to imgur, but I posted it to Reddit too)

When a post on Reddit hits the FP it automatically hits imgur’s FP. I’m wondering if it has something to do with Reddit posts being successful on more than one subreddit. I.e for some reason imgur is putting the post back into most viral/newest first every time the post does well enough in each subreddit. Not sure.